Really being interested in other people and how they are getting along.

Proposing your product as a solution to their problem only in an offhand way, not assertive.

Or, better yet, never bringing up what you do at all - but only providing excellent content and great comments on others' sites which forwards the conversation in a sequitur manner and contributes valuable service to that niche community.

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But I imagine you have a better look at this than I do -- what's your take on this?